Exercise device



FIG. 1 is a perspective view of exercise device showing my new design;

FIG. 2 is a a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for exercise device, as shown and described. 